Gas-burner



- H. C. CALDWiE-LL.

GAS BURNER.

APPLICATION FIL'ED JULY 11. 1920.

Patented Aug. 16,.1921.

In 1/1212 tor HENRY c. oALnwE nj or .BUrrA ofNEw-xom.

L '5 GAs-BURNERQQf To all whom itmay concern:

Be it known that I, Hmvnx CALDWEnL, a citizen of the United States .of

'Gas-Burners, of which the following is a art that, in the present day typeof burners,- combustion of the fuel elements takes place at the point where the heat is to be utilized; thus resulting in a large percentage of heat being lostby direct radiation into the at-- mosphere and also by convection through the parts of the burner; Furthermore, this type of burner when an attempt s made to add the proper amount of air nee essary, for proper combustion;back-firing into the mixer of the burner usually occurs;

In producing my'invention, I have sought}. to overcome the disadvantages above enu-' merated and to construct a burner in which substantially perfect combustion of the fuel elements shall take place within theburner itself and before the flame reaches the point of utilization.

Furthermore, in my burner, large amounts Y of air are supplied at the mixer of the burner to provide for proper initial combus tion; and these amounts of air-are reduced in. volumewhen the burner is shut on, thereby preventing the possibility of back-firing Moreover, by providing'one or more chambers through which auxiliary air is suppliedto the other fuel elements combustion occurs within the burner, and thereby produces aj j p111 and; n interspaeed-relation therewith'is an 18. Between the innerand natural draft through the burner'which aids in drawing in the fuel elements and,

further, prevents back-firing. I,

. Another object of my invention'has been for automatically cleaning the slots ofthe f" r sp'ectivelygare closed at of end walls 25.

mixer tube. v

a The above objects and advantages have America, it and a resident ofthe city of Buffalo,county of Erie, State of NewYork, have invented Specification of Letters latent; iPatntd Aug; 16', 1921 Application mm aul i z; i9 0.---seria11v. 396,905. A

beenaccomplished by the deviceshown in the accompanyingdrawings, of which i Figural is a sectional, perspective view of "my complete burner. g V, o

' F 1g.'2-is"a transverse, sectional elevation -Fig. 3 is a fragmentary elevation, partly 1n sectlonpof the mixer tube of mydevice,

of the same.

Fig. it is a fragmentary cross-sectional view of the vmixertube and is taken on line portsall the parts "of the the base is arranged the'outer jacket-or body 11 of my: burner,-;which is connected with the base 10 by means of a tubul'arextension 12. Thistu-bular extension is open at. the

opens into the inside body 11 st its upper end.

is provided around its ral ty of openings. 1' atmosphere will beadmitted to the tubular extension 12. Supported on top of the outer' -jacket or body .l'l'isfa combustion chamber l3, whi'ch 'incloses the majorv portion of the {combustion zone of my burner,

provides a support for the and whiehfalso grid members l4 (see Fig. 2), The combustion chamber 13 iS lPro'Vided with a central opening15 which communicates with a suitable opening formed 'inthe top of the outer .jacketllp.

Arranged within the outer jacket or inner jacket outer jackets 1 1 and 18, respectively, there is provided an auxiliary airspace 19*whichrece ves its s'upply of air througa the center of the tubular extension 12; An opening 20 isprOvided in the top of this inner v 7 position with Fig. 5 is a cross-sectional view taken on Y line My device comprises a base 10 which supburner. Above.

21 is a mixing tube which web 31 is provided with a slot 42 in whicha forms a primary mixing chamber and is supported by the end walls 25. The tube is arranged preferably concentric with the jackets 11 and 18, and is provided with two series of longitudinal slots 22. solid portion 23 of substantially the same length as the slots 22, connects the portions of-the tube in which the slots. are provided. A solid portion 24 is also provided at the end of the tube, which port-i on" preferably entends beyond the end walls 25 of the burner. U

The opposite end of the tube 21 preferably extends from the end wall 25 and is cut tube with the body thereof are two webs and 31.

Mounted within the mixing tube 21 is throttle tube 35 which is provided with two open portions 36 connected by a solid por-.

tion 37. Vhen the throttle tube is in its full open position the openportions 36 are in register with the slotted portions 22 of the mixing tube and the solid portion 37 is in registering position with the solid portion 23 of said tube. The throttle tube is provided at the right hand end .of each of the open portions 36 with a plurality of radially extending tabs38, which are disposed, one

within each of the series of longitudinal slots 22. The throttle tube 35 is also provided with a solid portion 39 at its extreme right hand end. As the throttle tubeis drawn endwise within the mixing tube 21, the solid portions 37 and 39 will serve tothrottle or close. the series of longitudinal slots 22. i By moving this tube, the air openings 26 in the left hand end of the tube will also be partially closed. If the throttle tube is moved back and forth, it will be seen that the. tabs 38 will keep the slots 22 free from accumulation of dirt or carbon. In the web 30 a slot 4L0 isprovided through which an operating rod 11 is slidab le. This operating rod is connected to the throttle tube 35, andprovides means for actuating this tube. The

rod 43, connected with the throttle .tu-be'35, is slidablef The gas shut off valve 28 is provided with an arm 44 which is arranged preferably at right angles to the handle A5 of the valve, and connecting the outer end of this arm with the rod 43 is an S-shaped, link.

46. The outer end of the link is bent in the form of a semi-circle, having its radius equal to the radius of the arm 14:, whereby, when the throttle tube 35 is in its closed position,

the gas valve 28 may be opened while the outer end of the arm44'pas'ses through a slot 47 formed in this portion of the link. This motion permits the valve to be opened without actuating the throttle tube. 'By this tube may be opened without: alteringsthe position of the gas valve 28', and that when it is in its full open position as shown in the drawings, the tube will be pulled to its closed posit-ion while thegas valve 28 is being closed,thus partially closing the air openings26' and effectively preventing any possibility of back-firing.

construction, it will be seen that the throttle I A slide 4:8 is arranged preferably o-nthe inside O f the inner jacket 18 and it is movable over the opening 29 in this jacket. A rod 49 connects the slide; with the throttle tube 21 so 'that'they are operated in unison.

.The size of, the opening 20' is thus controlled as the size of the'slot 22 is controlled. This keeps the point of initial combustion always atthe opening '20.

[It will thus be 'seenthatwhen my burner is first lighted, the throttle tube 35 I is in its closed position. I The gasvalve: 28 is moved to its full openposition and the supply of gas is regulated by the gas regulating valve 29.. Additional air is supplied to the mixer by moving the throttle, tube 35 inwardly, which increases the effective size of the air openings 26 and at the same time increases the effective size of-the longitudinal slots 22in the; mixer tube. As the products of combustion pass through the slots 22 into thesecondary mixing chamber 50, they are more thoroughly commingled and pass thence upwardly through the opening. 20 formed in the inner jacket 18 and pass up through the opening 15 of the stack 13. As the products of combustion pass through the opening 20, auxiliaryair coming in through the opening 17 of the base 10 passesup through the tubular extension 12' and'into the auxiliary air space 19, where it mixes with the fuel elements after it has circulated around the air space. through this space, it takes up the heat produced in the jackets by radiation or convection and as the auxiliary air 'is mixing with the products of combustion coming through the opening 20, combustion is producedat this point within-the burner.- it

will be clear thatwhen the'gas valve .28 is shut off, the throttle tube'35 will be drawn As a this air passes" I am enabled to supply all the air necessary.

for proper and efficient combustion of the fuel elements withoutthe possibility of back firing when the gas is shut off and also to accomplish the otherobjects and advan- 1 v tages herein set forth.

While I have: shown but one auxiliary airspace,' it=is obvious that more thanronje may be provided for supplying additional air'to" the fuel mixture. This and'other flmodificarl tions of: the details herein shown and described may be madewithout departing from" the spirit of myinvention or'the scope of the appended claims and I'doanot, therefore,

quantity of gas introduced into the tube.

wish to be limited to the exact embodiment herein shown and described, the formdescribed being merely a preferred embodiment 5 thereof. 7

Having thus described my invention, What I claim is I j e l. A gas burner characterized by having a jacket forming a secondary mixing chamber, a combustion chamber mounted on the jacket and in communication with the interior thereof, a mixing tube passing through the secondary mixing chamber and forming a primary mixing chamber, such tube being provided with fuel elementoutlets, means for projecting gas under pressure. through an air space located between the tube and the gas outlets and thence into the tube, and valve controlled means for regulating the 2. A gas burnercha'racterized by having a jacketforming a secondary mixing chamber, a combustion chamber mounted on the jacket and in communication with the interior thereof, a mixing tube passing through the secondary mixingchamber and forming a primary mixing chamber, such tube being provided with fuel element outlets, means for projecting gas under pressure through an air space located between the tube and the, gas outlets and thence into the tube, valve controlled means for regulating the quantity of gas introduced into the tube, and means for controlling the admission of airto the air space. f V

3. A gas burner characterized by having a jacket forming a secondary mixing chamber, a combustion chamber mounted on-the jacket and in communicationwith the interior thereof, a, mixing tube passing through the secondary mixing chamber and forming a primary mixing chamber, such tube being providedwith fuel element outlets, means for projecting gas under pressure through an air space located between the tube and the gas outlets and thence into the tube, valve controlled means for regulating the quantity of gas introduced into the tube,

and means for supplying additional air to the fuel elements at the combustion zone1 4. A gas burner characterized by having a jacket forming a secondary mixing chamber, a combustion chamber mounted on the jacket and in communication with the interior thereof, a mixing tube passing through the secondary mixing chamber and forming a primary m1x1ngchamber, such tube being provided with fuel element outthe tube.

6. A gas burner characterized by having letsfmeans for projecting g igas under pres I sure through an air space located betweenil the tube and the gas outlets and thence into; tl'1e tube, valve controlled means for regu lating the quantity of gas introduced into- 'thetube," and means for regulating the size of the fuel element outlets. A g V g I o 5; A gas burner characterized-by having an outer jacket, an inner j acketarranged in through'an air space located between the,

tube and the gas outlet and thence into the tube, and valve controlled means for regulating the quantity of gas introduced into a j acketforming a secondary mixing chamber, a combustion chamber mounted on the jacket and in communication with the inte rior thereof, a mixing tube passing through the secondary mixing'chamber and forming a primary mixing chamber, the tube being formed with a series of longitudinal fuel elementoutlets, a throttle tube for controlling the size of the fuel element outlets,

means for projecting gas under pressure through an (air space located between the tube and the gas outlet and thence into the tube and valve controlled means for regulating the quantity .ofgas introduced into the tube.

7. A gas burner characterized by having a jacket forming a secondary mixing cham* ber, a combustion chamber mounted on the jacket and in communication with the interior thereof,,a mixing tube passing through the secondary mixing chamber and forming aprimary mixing chamber, the tube being formed with a series of longitudinal fuel element outlets, a throttle tube for controlling the size of the fuel element outlets, and 7 the admission of air to the air space, means for projecting gas under pressure through an air space located between the tube and the gas outlet and thence into the tube and valve controlled means for regulating the quantity of gas introduced into the tube.

I 8.-A gas burner characterized by having a jacket forming a secondary mixing chamber, a combustion chamber mounted on the jacket and in communication with the interior thereof, a mixing tube passing through the secondary mixing chamber and forming a primary mixingchamber, such tubekbeing provided with fuel element outlets, means for projecting gas under pressure through an air space located between the. tube and means forregulatingthe size of the fuel eIe- Inent; outlets and for controlling the adnlission of ai'r to the airspace, and means; for 10 supplying additionalxairto the fuel elements at the combustion zone. 7 .7

Intestimony whereoffll have hereunto signed: my name. h a s c ENRYCQOALDLWE L. 

